// This file is part of Substrate.

// Copyright (C) 2017-2022 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Support functions for ed_on_bls12_381_bandersnatch to improve the
//! performance of msm' and projective multiplications by host function
//! calls.

use crate::utils::{
	msm_sw_generic, msm_te_generic, mul_projective_generic, mul_projective_te_generic,
};
use ark_ed_on_bls12_381_bandersnatch::BandersnatchConfig;
use sp_std::vec::Vec;

/// Compute a multi scalar multiplication for short_weierstrass through
/// arkworks.
pub fn sw_msm(bases: Vec<u8>, scalars: Vec<u8>) -> Result<Vec<u8>, ()> {
	msm_sw_generic::<BandersnatchConfig>(bases, scalars)
}

/// Compute a multi scalar mulitplication for twisted_edwards through
/// arkworks.
pub fn te_msm(bases: Vec<u8>, scalars: Vec<u8>) -> Result<Vec<u8>, ()> {
	msm_te_generic::<BandersnatchConfig>(bases, scalars)
}

/// Compute a projective scalar multiplication for short_weierstrass
/// through arkworks.
pub fn sw_mul_projective(base: Vec<u8>, scalar: Vec<u8>) -> Result<Vec<u8>, ()> {
	mul_projective_generic::<BandersnatchConfig>(base, scalar)
}

/// Compute a projective scalar multiplication for twisted_edwards
/// through arkworks.
pub fn te_mul_projective(base: Vec<u8>, scalar: Vec<u8>) -> Result<Vec<u8>, ()> {
	mul_projective_te_generic::<BandersnatchConfig>(base, scalar)
}

#[cfg(test)]
mod tests {
	use super::*;
	use ark_algebra_test_templates::*;
	use sp_ark_ed_on_bls12_381_bandersnatch::{
		EdwardsProjective as EdwardsProjectiveHost, HostFunctions, SWProjective as SWProjectiveHost,
	};

	pub struct Host {}

	impl HostFunctions for Host {
		fn ed_on_bls12_381_bandersnatch_te_msm(
			bases: Vec<u8>,
			scalars: Vec<u8>,
		) -> Result<Vec<u8>, ()> {
			crate::elliptic_curves::ed_on_bls12_381_bandersnatch_te_msm(bases, scalars)
		}
		fn ed_on_bls12_381_bandersnatch_sw_msm(
			bases: Vec<u8>,
			scalars: Vec<u8>,
		) -> Result<Vec<u8>, ()> {
			crate::elliptic_curves::ed_on_bls12_381_bandersnatch_sw_msm(bases, scalars)
		}
		fn ed_on_bls12_381_bandersnatch_te_mul_projective(
			base: Vec<u8>,
			scalar: Vec<u8>,
		) -> Result<Vec<u8>, ()> {
			crate::elliptic_curves::ed_on_bls12_381_bandersnatch_te_mul_projective(base, scalar)
		}
		fn ed_on_bls12_381_bandersnatch_sw_mul_projective(
			base: Vec<u8>,
			scalar: Vec<u8>,
		) -> Result<Vec<u8>, ()> {
			crate::elliptic_curves::ed_on_bls12_381_bandersnatch_sw_mul_projective(base, scalar)
		}
	}

	type EdwardsProjective = EdwardsProjectiveHost<Host>;
	type SWProjective = SWProjectiveHost<Host>;

	test_group!(sw; SWProjective; sw);
	test_group!(te; EdwardsProjective; te);
}
